If a thumbs.db file cannot be deleted from a network share even though no one is accessing the folder in which it resides, turn off caching of thumbnails in the default domain group policy.
Windows Server 2008 or later
Windows Vista or later
1. Open the Group Policy snap-in
2. Under User Configuration, expand Policies, expand Administrative Templates, expand Windows Components and then click Windows Explorer.
3. In the details pane double click Turn off the caching of thumbnails in hidden thumbs.db files
4. Click Disable
If you have any questions, please contact Vantage IT.